Restart your computer
Enter the BIOS or UEFI setup by pressing the required key during startup
Find the Boot, Security, or Authentication menu
Disable Legacy Boot or CSM if it is enabled
Set Boot Mode to UEFI
Locate the Secure Boot option
Change Secure Boot to Enabled
Save the changes and exit BIOS or UEFI
Restart the computer
Verify that Secure Boot is enabled in system settings